使用EnumDisplaySettings获取屏幕颜色数

​​编者：李国帅​​


背景原因:

判断当前屏幕的颜色数，因为远程桌面播放视频时，将播放格式限定为只能是16位色。

 

所需资源：

VC

 

解决方案:

int m_nBitsPerPel;       //获得系统颜色数
int m_nDisplayFrequency;//至少包含分辨率和刷新率
    m_nBitsPerPel = 16;
    m_nDisplayFrequency = 70;
 
    DEVMODE dmDevMode;
    EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS,&dmDevMode);
    m_nBitsPerPel = dmDevMode.dmBitsPerPel;
    m_nDisplayFrequency = dmDevMode.dmDisplayFrequency;
 
    if(m_nBitsPerPel > 16)
    {
        LONG nConfirm = IDNO;
        LONG nCurLang =((CXXRunApp*)AfxGetApp())->m_nCurLang;
        if(nCurLang == 0)
        {
            nConfirm = MessageBox(L"客户端在16位显示模式下有较好的性能，是否要改变？",L"提示",MB_YESNO);
        }
        else
        {
            nConfirm = MessageBox(L"Client have better performance in 16 BitsPerPel, will you change to it？",L"Tip",MB_YESNO);
        }
        if(nConfirm == IDYES)
        {//如果颜色数>16,更改为16色深显示。
            memset(&dmDevMode, 0,sizeof(dmDevMode));
            dmDevMode.dmBitsPerPel=16;
            dmDevMode.dmDisplayFrequency=m_nDisplayFrequency;
            dmDevMode.dmSize=sizeof(DEVMODE);
            dmDevMode.dmFields=DM_BITSPERPEL|DM_DISPLAYFREQUENCY;
            ChangeDisplaySettings(&dmDevMode, CDS_FULLSCREEN);
        }
    }